Atopy is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop.
As of 2012, 63.9 percent of players playing in Major League Baseball are white. There is no way of telling the exact number due to the number of players.
MLB. 1  Active list - Also called the active roster, the 25-man is composed of 25 players who are playing for their Major League team. 2  Reserved list - Defined in Major League Rule 2, the 40-man roster is also known as the Major League Reserve List.